If you would like to receive Announcement postings to your email, check your Canvas Notification settings at the account level and within course sites.
If you would like to control Notifications within a course, which will override Account Notifications, you can adjust Notification settings within an individual course.
Announcement Notifications are only delivered from Published courses. If a course is unpublished, Announcement postings display in the course Announcements, but those postings are not delivered to email. If you want Announcement postings to deliver as email Notifications to students, be sure to Publish the Course before you begin posting in Announcements.